Power Storage Packaging Material for Deep Drawing and Seal Reliability
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Solution Overview
Problem
Existing packaging materials for lithium ion batteries face issues with deep drawing formability and sealing failures during heat sealing, primarily due to the accumulation and carbonization of slip agents in the seal bar, leading to frequent cleaning needs and potential sealing errors.
Innovation Solution
A packaging material configuration comprising a slip agent layer with a fatty acid amide and fatty acid bisamide mixture, a substrate layer, an adhesive layer, a metal foil layer with anticorrosion treatment, and a sealant layer, which improves deep drawing formability and prevents sealing failures by controlling the accumulation of slip agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outermost layer surface is coated with a slip agent (e.g., erucic acid amide) to improve deep drawing formability, then the drawing performance is improved, but the slip agent accumulates in the seal bar during continuous heat sealing, carbonizes and solidifies, causing sealing failure
Solution Approach 1:
The patent changes the chemical composition parameters of the slip agent layer by specifying a particular mixture ratio of fatty acid amide (70-30 mass%) and fatty acid bisamide (30-70 mass%). This parameter optimization allows the slip agent to maintain effective lubrication for deep drawing while reducing excessive migration to the seal bar, thereby preventing carbonization and sealing failures.
Solution Approach 2:
The patent creates a composite slip agent system by combining fatty acid amide and fatty acid bisamide in specific proportions. This composite approach leverages the complementary properties of both compounds: fatty acid amide provides excellent slip properties for deep drawing, while fatty acid bisamide contributes to thermal stability and reduced seal bar accumulation, thus resolving the contradiction between formability and sealing reliability.
2Measurement precision
If silicone material is coated on the outermost layer to reduce bar-code reading errors from inkjet ink smearing, then print quality is improved, but the silicone material promotes accumulation of slip agent in the seal bar
Solution Approach 1:
The patent optimizes the composition parameters of the slip agent layer to counteract the harmful effect of silicone material. By adjusting the ratio of fatty acid amide to fatty acid bisamide and controlling the total slip agent content, the patent reduces excessive slip agent migration to the seal bar even in the presence of silicone coating, thereby maintaining both print quality and sealing reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed packaging material ensures sufficient deep drawing formability and prevents sealing failures during heat sealing, maintaining the integrity and performance of lithium ion batteries.
Implementation Method 1
For the improvement of the drawing performance, particularly the performance of deep drawing of the packaging material for a power storage device, slippage is required for the outermost layer of the packaging material
Implementation Method 2
heat sealing the edge portions
Data Source
Figure 1
Figure 2~2(b)
Figure 3~3(d)
AI summary
The present invention relates to a packaging material for a power storage device, the packaging material including at least a slip agent layer, a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer in this order, wherein the slip agent layer contains a fatty acid amide and a fatty acid bisamide, or a fatty acid amide and silicone oil.